Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 13: Photoionization
A 13.1: Vortrag
Dienstag, 13. März 2012, 10:30–10:45, V55.01
One- and two-photon single ionization of 1D helium: resolving the role of individual decay channels and resonance states — Vera Neimanns1, Pierre Lugan2, •Klaus Zimmermann1, Felix Joerder1, and Andreas Buchleitner1 — 1Quantum Optics and Statistics, Physikalisches Institut, Universitaet Freiburg, Germany — 2Laboratory of Theoretical Physics of Nanosystems, Institute of Theoretical Physics, EPF Lausanne, Switzerland
We combine the method of complex rotation and Floquet theory to analyze the multiphoton ionization of helium atoms in strong laser fields. We focus on 1D Z2+e−e− helium to highlight the methods that allow us to extract the partial decay rates associated with various decay channels. In the regime of one-photon single ionization, we study the dependence of the partial rates associated with the singly ionized He+(N) states on the field frequency. We show that the electron-electron interaction provides couplings to higher single-ionization continua. Finally, we examine two-photon single-ionization processes, and analyze the role of the internal electronic structure of the atom, specifically the signature of resonant coupling to intermediate bound states on the decay rates.